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Recognised as Colour

#EFFF04

  • #EFFF04
  • Yellow
  • Light
  • Nearest: Yellow

#EFFF04 is a yellow with RGB values 239, 255, 4 and HSL 64°, 100%, 51%. It is a light colour, so black text on it reaches 19:1 contrast (AAA for normal text). The nearest named colour is Yellow.

Colour values

#EFFF04#EFFF04
HEX#EFFF04
RGBrgb(239, 255, 4)
RGB (0–1)0.9373, 1, 0.0157
RGB percentages93.7%, 100%, 1.6%
HSLhsl(63.8, 100%, 50.8%)
HSV / HSBhsv(63.8, 98.4%, 100%)
CMYK6.3%, 0%, 98.4%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer15,728,388
CSS custom property--colour: #EFFF04;

Brightness & contrast

Relative luminance0.89879WCAG 2.x, 0 is black and 1 is white
Perceived brightness235.1 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 18.98:1
Contrast with white1.11:1WCAG normal text: Fail
Contrast with black18.98:1WCAG normal text: AAA
Greyscale equivalent#E9E9E9
Inverted#1000FB

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#FFF200no red cones; affects about 1% of men; ΔE 12.9 from the original
Deuteranopia#FFF534no green cones; the most common form, about 1% of men; ΔE 14.4 from the original
Tritanopia#FFEFD9no blue cones; rare, and affects men and women equally; ΔE 85.6 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text1.11:1WCAG large text: Fail
Contrast with black, large text18.98:1WCAG large text: AAA

Named colours

Yellow · ΔE 6.8Green yellow · ΔE 27.1Gold · ΔE 28.2Yellow green · ΔE 34.1Chartreuse · ΔE 41.1Lawn green · ΔE 41.2
Nearest named CSS colourYellow (#FFFF00)ΔE 6.82, clearly different but related
Hue familyyellow
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#1404FF
Analogous#FF9204, #72FF04
Triadic#04EFFF, #FF04EF
Split complementary#0471FF, #9204FF
Tetradic#04FF92, #1404FF, #FF0471

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FCFFD0
Lighter +30%#F9FF9D
Lighter +20%#F6FF6A
Lighter +10%#F2FF37
Darker −10%#C3D000
Darker −20%#939D00
Darker −30%#636A00
Darker −40%#333700
More saturated +25%#EFFF04
Less saturated −25%#D4E023

Channel breakdown

R239
G255
B4
Red239 (93.7%)
Green255 (100%)
Blue4 (1.6%)
Hue63.82°
Saturation (HSL)100%
Lightness50.78%
Dominant channelGreen
Hex per channelR EF · G FF · B 04

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Every value on this page was computed from “efff04” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.